I had a similar experience in that I was burned by hot engine coolant almost 20 years ago. Bought a K-10 chevy with a snow plow, buddy helping me, said nah, leave the plow on, mind you it was close to summer time, well it started to overheat, me not wanting to be confrontational, went along with leaving it on, but figured it best to have removed the radiator cap so it did not build pressure, and I did so with no problem before we were on our way, still having trouble, ( I knew the plow had to come off and be placed in the bed, and figured I'd get someone else so as not to argue with a friend ) and it being at night, I decided it best to park the truck and get it the next day, so I parked it and so as not to lose the cap, why not just put it back on the radiator where it belongs, well just as I'm doing just that, reaching over the neck of the radiator to put the cap on, it blew, the thing blew like I had the cap on and let it build up pressure, then removed it, which I was not dumb enough to ever try. It blew in my face, but instinctively, as if someone was throwing a punch at my face I used a forearm block and cut off the path of that hot burning fluid. Best I can figure is that there was an internal blockage and it cleared, was a small block chevy 350. My face was unscathed, but my forearm was burnt nicely, and it hurt like h$ll, got into the vehicle, friend was laughing and unbelievably so was I, he said I must have ran 100 yards. I rode home with my arm out the window to cool it, suffered the rest of the night, then the pain went away completely, it looked real nasty, eventually skin hanging off etc. but I took care of it and when it started healing up, applied Vitamin E, cocoa butter etc. not even a hint of a scar or discoloration, not sure why, but I think it was due to the type of burn, hopefully yours will do the same thing, hot radiator and cooling system ain't nothing to fool with even if you think its safe to do so, certainly can attest to that !
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